[08/16] batman-adv: Add inconsistent hardif netlink dump detection

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 781c5b6e6e8e..508f4416dfc9 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -951,6 +951,7 @@  batadv_hardif_add_interface(struct net_device *net_dev)
 	batadv_check_known_mac_addr(hard_iface->net_dev);
 	kref_get(&hard_iface->refcount);
 	list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
+	batadv_hardif_generation++;
 
 	return hard_iface;
 
@@ -993,6 +994,7 @@  void batadv_hardif_remove_interfaces(void)
 	list_for_each_entry_safe(hard_iface, hard_iface_tmp,
 				 &batadv_hardif_list, list) {
 		list_del_rcu(&hard_iface->list);
+		batadv_hardif_generation++;
 		batadv_hardif_remove_interface(hard_iface);
 	}
 	rtnl_unlock();
@@ -1054,6 +1056,7 @@  static int batadv_hard_if_event(struct notifier_block *this,
 	case NETDEV_UNREGISTER:
 	case NETDEV_PRE_TYPE_CHANGE:
 		list_del_rcu(&hard_iface->list);
+		batadv_hardif_generation++;
 
 		batadv_hardif_remove_interface(hard_iface);
 		break;
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index c75e47826949..d1ed839fd32b 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -74,6 +74,7 @@ 
  * list traversals just rcu-locked
  */
 struct list_head batadv_hardif_list;
+unsigned int batadv_hardif_generation;
 static int (*batadv_rx_handler[256])(struct sk_buff *skb,
 				     struct batadv_hard_iface *recv_if);
 
diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index b68a41190eb0..b572066325e4 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -247,6 +247,7 @@  static inline int batadv_print_vid(unsigned short vid)
 }
 
 extern struct list_head batadv_hardif_list;
+extern unsigned int batadv_hardif_generation;
 
 extern unsigned char batadv_broadcast_addr[];
 extern struct workqueue_struct *batadv_event_workqueue;
diff --git a/net/batman-adv/netlink.c b/net/batman-adv/netlink.c
index 0d9459b69bdb..2dc3304cee54 100644
--- a/net/batman-adv/netlink.c
+++ b/net/batman-adv/netlink.c
@@ -29,11 +29,11 @@ 
 #include <linux/if_ether.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/list.h>
 #include <linux/netdevice.h>
 #include <linux/netlink.h>
 #include <linux/printk.h>
-#include <linux/rculist.h>
-#include <linux/rcupdate.h>
+#include <linux/rtnetlink.h>
 #include <linux/skbuff.h>
 #include <linux/stddef.h>
 #include <linux/types.h>
@@ -445,23 +445,27 @@  batadv_netlink_tp_meter_cancel(struct sk_buff *skb, struct genl_info *info)
  * batadv_netlink_dump_hardif_entry() - Dump one hard interface into a message
  * @msg: Netlink message to dump into
  * @portid: Port making netlink request
- * @seq: Sequence number of netlink message
+ * @cb: Control block containing additional options
  * @hard_iface: Hard interface to dump
  *
  * Return: error code, or 0 on success
  */
 static int
-batadv_netlink_dump_hardif_entry(struct sk_buff *msg, u32 portid, u32 seq,
+batadv_netlink_dump_hardif_entry(struct sk_buff *msg, u32 portid,
+				 struct netlink_callback *cb,
 				 struct batadv_hard_iface *hard_iface)
 {
 	struct net_device *net_dev = hard_iface->net_dev;
 	void *hdr;
 
-	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, NLM_F_MULTI,
+	hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq,
+			  &batadv_netlink_family, NLM_F_MULTI,
 			  BATADV_CMD_GET_HARDIFS);
 	if (!hdr)
 		return -EMSGSIZE;
 
+	genl_dump_check_consistent(cb, hdr);
+
 	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
 			net_dev->ifindex) ||
 	    nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
@@ -498,7 +502,6 @@  batadv_netlink_dump_hardifs(struct sk_buff *msg, struct netlink_callback *cb)
 	struct batadv_hard_iface *hard_iface;
 	int ifindex;
 	int portid = NETLINK_CB(cb->skb).portid;
-	int seq = cb->nlh->nlmsg_seq;
 	int skip = cb->args[0];
 	int i = 0;
 
@@ -516,23 +519,24 @@  batadv_netlink_dump_hardifs(struct sk_buff *msg, struct netlink_callback *cb)
 		return -ENODEV;
 	}
 
-	rcu_read_lock();
+	rtnl_lock();
+	cb->seq = batadv_hardif_generation << 1 | 1;
 
-	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
+	list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
 		if (hard_iface->soft_iface != soft_iface)
 			continue;
 
 		if (i++ < skip)
 			continue;
 
-		if (batadv_netlink_dump_hardif_entry(msg, portid, seq,
+		if (batadv_netlink_dump_hardif_entry(msg, portid, cb,
 						     hard_iface)) {
 			i--;
 			break;
 		}
 	}
 
-	rcu_read_unlock();
+	rtnl_unlock();
 
 	dev_put(soft_iface);